[LLVMbugs] [Bug 8983] New: segfault in Combine redundant instructions pass

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8983

           Summary: segfault in Combine redundant instructions pass
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: marc.glisse at normalesup.org
                CC: llvmbugs at cs.uiuc.edu


struct basic_ios { 
char widen ( char __c ) const ; 
} ; 
struct ostream : virtual basic_ios { 
} ; 
void endl ( ostream & __os ) { 
__os . widen ( '\n' ) ; 
} 
void f ( ) { 
ostream * m_os ; 
endl ( * m_os ) ; 
m_os = 0 ; 
} 

$ clang++ -O2 -c b.cc
0  clang           0x000000000175402f
1  clang           0x0000000001756292
2  libpthread.so.0 0x00007f8758dcff60
3  clang           0x000000000078b908 llvm::Value::getType() const + 8
4  clang           0x0000000001565a5b
5  clang           0x000000000156684e llvm::ConstantFoldInstOperands(unsigned
int, llvm::Type const*, llvm::Constant* const*, unsigned int, llvm::TargetData
const*) + 1854
6  clang           0x0000000001568102
llvm::ConstantFoldInstruction(llvm::Instruction*, llvm::TargetData const*) +
290
7  clang           0x00000000014b50a4
8  clang           0x00000000014b5dd7
9  clang           0x00000000016a4acd
llvm::FPPassManager::runOnFunction(llvm::Function&) + 557
10 clang           0x00000000015524ad
11 clang           0x00000000016a4657
llvm::MPPassManager::runOnModule(llvm::Module&) + 503
12 clang           0x00000000016a47d7 llvm::PassManagerImpl::run(llvm::Module&)
+ 167
13 clang           0x000000000077ec29
clang::EmitBackendOutput(clang::Diagnostic&, clang::CodeGenOptions const&,
clang::TargetOptions const&, llvm::Module*, clang::BackendAction,
llvm::raw_ostream*) + 2281
14 clang           0x000000000077b54b
15 clang           0x000000000089b75d clang::ParseAST(clang::Sema&, bool) + 301
16 clang           0x000000000077c414 clang::CodeGenAction::ExecuteAction() +
68
17 clang           0x0000000000673205
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 357
18 clang           0x00000000006511dc
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 1276
19 clang           0x0000000000648cb5 cc1_main(char const**, char const**, char
const*, void*) + 677
20 clang           0x00000000006501e5 main + 4549
21 libc.so.6       0x00007f87580cec4d __libc_start_main + 253
22 clang           0x00000000006473b9
Stack dump:
0.      Program arguments: /tmp/clang/inst/bin/clang -cc1 -triple
x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name b.cc
-mrelocation-model static -mdisable-fp-elim -masm-verbose -mconstructor-aliases
-munwind-tables -target-cpu x86-64 -target-linker-version 2.20.1 -resource-dir
/tmp/clang/inst/bin/../lib/clang/2.9 -O2 -ferror-limit 19 -fmessage-length 158
-fexceptions -fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o b.o
-x c++ b.cc 
1.      <eof> parser at end of file
2.      Per-module optimization passes
3.      Running pass 'CallGraph Pass Manager' on module 'b.cc'.
4.      Running pass 'Combine redundant instructions' on function '@_Z1fv'
clang: error: unable to execute command: Segmentation fault
clang: error: clang frontend command failed due to signal 1 (use -v to see
invocation)

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